president obama: i'm barack obama and... i approve this message. [ female announcer ] the power to become a better investor has gone mobile. with features like scanning a barcode to get detailed stock quotes to voice recognition. e-trade leads the way in wherever, whenever investing. download the ultimate in mobile investing apps, free, at e-trade. [ticking] >> shale gas may be a significant new energy source, but it may come with some very toxic side effects. among them, the chemicals used in fracking may cause health problems and contaminate the water supply. the safety record of chesapeake energy may be better than most, but the company had an accident in louisiana that drew a lot of attention. it happened in 2009 when 17 cows grazing near a drilling site died a gruesome death after drinking fracking fluids that ran off into their pasture. industry-wide, accidents keep happening-- like this well explosion-- due to machine malfunctions or workers cutting corners. environmentalists like michael brune, executive director of